Dark Record Button (made in Flutter)

Yet again, not a fancy pic or prototype but a real working button (with light and dark versions).
This is designed with a code and made in Flutter without any 3rd-party dependencies (it's written a in pure Dart). You can see it, play with colors and other parameters in code, alive, online, here:
https://dartpad.dev/215324b07914c83f9a978450a12cb360
Light version is also available online (change theme via switch on right top corner), or just take a look at rebound shot here on dribbble.
Check it as a part of the application itself at Google Play Store. Feedback is welcome, thanks for watching!